User:Erannaveh/ANDSF

Access Network Discovery and Selection Function (ANDSF)
Access Network Discovery and Selection Function (ANDSF) is an entity within an Evolved Packet Core (EPC) of the Service Architecture Evolution (SAE) for 3GPP compliant mobile networks. The purpose of the ANDSF is to assist User Equipment (UE) to discover non-3GPP access networks – such as Wi-Fi or WIMAX – that can be used for data communications in addition to 3GPP access networks (such as HSPA or LTE) and to provide the UE with rules policing the connection to these networks.

An ANDSF can provide the following information to a UE, based on operator configuration: The ANDSF communicates with the UE over the S14 reference point, which is essentially a synchronization of an OMA-DM Management Object (MO) specific to ANDSF.
 * Inter-System Mobility Policy (ISMP)– network selections rules for a UE with more than one active access network connection (e.g., either LTE or Wi-Fi)
 * Inter-System Routing Policy (ISRP) – network selection rules for a UE with potentially more than one active access network connection (e.g., both LTE and Wi-Fi). Such UE may employ IP Flow Mobility (IFOM), Multiple Access PDN Connectivity (MAPCON) or non-seamless Wi-Fi offload according to operator policy and user preferences.
 * Discovery Information – a list of networks that may be available in the vicinity of the UE and information assisting the UE to expedite the connection to these networks

History
The term ANDSF was first conceived by the 3GPP in Release 8 as part of the effort to standardise the behavior of the ever-growing abundance of 3GPP-compliant UEs (e.g. smartphones) that can also access non-3GPP data networks.

Known Implementations
Multiple UE vendors are currently engaged in implementing the ANDSF MO as part of their Mobile Device Management frameworks, with releases expected during 2012 and onwards.
 * WeANDSF - a commercial system employing data intelligence to discover and select the access network that is predicted to perform best for the specific UE time and location.

3GPP Specs

 * TS 23.402 Architecture enhancements for non-3GPP accesses
 * TS 24.302 Access to the 3GPP Evolved Packet Core (EPC) via non-3GPP access networks
 * TS 24.312 Access Network Discovery and Selection Function (ANDSF) Management Object (MO)